LOST ENTIRE DAY's WORK with DIMENSION

Yesterday I spent 8 hours plus working on a dimension 2d project. Dimension would regularly freeze in grey on me so I began saving every few minutes and at the end of the day I made sure to save the file as something memorable. Today I went to open the app and my file was nowhere to be find. There was the file listed in most recent list but file not found yet I never deleted the file. I never moved the file either and I 

did a thorough search to see if it ended up somewhere else. This would be impossible because only last

week I did my regular spring clean and export to ext HD. So I lost an entire day and then when I started over I noticed Dimension ripping through my memory so now I have made as much memore available as possible. It's stupid because the project I lost is a painstaking process of selecting one of over 60 objects to change their color and dimension. You can not group them in order to change many which is the craziest oversight! Also yor cannot select to upload to the cloud documents. Why am I paying for this crap? It has so much potential yet all I am doing is wasting precious time.